i have a 2 inch comptech header and a 3.36 inch rsr exhaust and i need a cat. i want to go carsound but they only make a 2 2.25 2.5 and 3 inch. i was going to gat a custom cat that was 2 inch at one end and 2.25 at the other for $160. the thing is i can get a 2.25 at both ends for $70 im just not sure if it will bolt to the header. im not sure if the flanges have the same bolt placement or not. if you know please fill me in.